A source tells Us that the newlyweds' cake -- a sugary confection from Hansen Cakes in L.A. - costs a whopping $15,000 to $20,000! The source says the cake is a knockoff of Prince William and Duchess Kate's wedding cake from their April 29 wedding.

Humphries and Kardashian got engaged in May after a six-month courtship. Kim's sisters, Kourtney and Khloe, served as co-maids of honor, while younger sisters Kendall, Kylie, and Kris' sister Kaela were bridesmaids. According to E! Online, all of Kim's bridesmaids wore ivory dresses by Vera Wang. Kourtney and Scott Disick's 20-month old son, Mason, was the ring bearer.

The newlyweds' celebrations won't end on Saturday. Eleven days after Kim and her NBA beau's nuptials, Niche Media founder Jason Binn and wedding planner to to the stars Colin Cowie are throwing the duo another bash in New York!